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Needle Valve
A needle-tipped screw that regulates the amount of fuel that passes is as it is turned in or out.
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Ni-CD
Nickel Cadmium. Substance used to make rechargeable batteries. Used for everything from radio transmitters, receivers, glow-plug ignitors and to power electric r/c vehicles. Has a tendency to build up "memory" after some time. The memory refers to the characteristic where the batteries tend to recharge only to the charging state of it's previous charge.
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Ni-MH
Nickel Metal Hydride. A newer solution to Ni-CD, this substance can hold more electrical energy per unit (watts) and isn't subject to the same memory characteristics, therefore determining when to charge isn't as critical as with Ni-CD's.
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Nitro
Refers to the fuel used in gas powered 2-cycle and some 4-cycle R/C scale engines. This is actually a mixture of methanol, nitromethane (CH3NO2) and castor or synthetic oils. Methanol (alcohol) makes up a majority of the fuel, with percentages of nitromethane ranging from anywhere from 10% - 40%, and the lubricating castor or synthetic oils making it last on the list.
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NORRCA
National Organization for Racing Radio Control Autos. A large organization for sanctioned racing in North America.
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